var path = require('path')
var express = require('express')
var webpack = require('webpack')
var config = require('./config')
var utils = require('./utils')
var proxyMiddleware = require('http-proxy-middleware')
var webpackConfig = process.env.NODE_ENV === 'testing'
    ? require('./webpack.prod.conf')
    : require('./webpack.dev.conf')


// default port where dev server listens for incoming traffic
var port = process.env.PORT || config.dev.port
// Define HTTP proxies to your custom API backend
// https://github.com/chimurai/http-proxy-middleware
var proxyTable = config.dev.proxyTable

require('./generator').watch();


var app = express()
var compiler = webpack(webpackConfig)

var devMiddleware = require('webpack-dev-middleware')(compiler, {
    publicPath: webpackConfig.output.assetsRoot,
    stats: {
        colors: true,
        chunks: false
    }
})

var hotMiddleware = require('webpack-hot-middleware')(compiler)
// force page reload when html-webpack-plugin template changes
compiler.plugin('compilation', function (compilation) {
    compilation.plugin('html-webpack-plugin-after-emit', function (data, cb) {
        hotMiddleware.publish({action: 'reload'})
        cb()
    })
})

// proxy api requests
Object.keys(proxyTable).forEach(function (context) {
    var options = proxyTable[context]
    if (typeof options === 'string') {
        options = {target: options}
        options.changeOrigin = true;
    }
    app.use(proxyMiddleware(context, options))
})

// handle fallback for HTML5 history API
app.use(require('connect-history-api-fallback')())

// serve webpack bundle output
app.use(devMiddleware)

// enable hot-reload and state-preserving
// compilation error display
app.use(hotMiddleware)

// serve pure static assets
var staticPath = path.posix.join(config.dev.assetsPublicPath, config.dev.assetsSubDirectory)
app.use(staticPath, express.static('./static'))

module.exports = app.listen(port, function (err) {
    if (err) {
        console.log(err)
        return
    }
    console.log('Listening at http://' + utils.getIP() + ':' + port + '\n')
})
